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Tension ring’s effect on PCO not yet clear, study suggests
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PARIS — The effect of capsular tension ring implantation on the formation of posterior capsular opacification is incompletely understood and may vary depending upon the design of the IOL implanted with the ring, a study presented here suggests.
Khiun Tjia, MD, of Zwolle, Netherlands, discussed the study at a session on PCO here at the European Society of Cataract and Refractive Surgeons meeting.
The study compared the effect on PCO of capsular tension rings (CTRs) simultaneously implanted with two types of hydrophobic acrylic IOL, the AcrySof three-piece MA60 with a squared posterior optic edge and the Advanced Medical Optics Sensar AR40 with a rounded edge. The IOLs were implanted bilaterally in 15 patients each, with a CTR in one eye of each patient and no CTR in the contralateral eye.
According to Dr. Tjia, in the 13 patients with the squared-edge IOL who completed 3-year follow-up, five YAG capsulotomies were needed in the eyes with a CTR and two were needed in the eyes with no CTR. In the 11 patients with the rounded-edge IOL who completed 3-year follow-up, there were no YAGs in the eyes with CTR and four in the eyes with no CTR.
“Our study suggests that the influence of tension rings on PCO is not clear, and that the effect may be different for rounded than for squared-edge IOLs,” Dr. Tjia said.
He said the data suggest that CTR placement does not prevent PCO formation — and may even increase its formation — in IOLs with squared edges, while conversely the CTR seemed to reduce PCO formation with the rounded-edge acrylic IOL.